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Fitbit study finds heart rate variability fluctuates by age, gender, time of day and activity level | MobiHealthNews
![fitbit on Twitter: "Got a Versa 3? Now, you've also got high & low heart rate notifications. Just update your watch in the Fitbit app. https://t.co/kn8Wb2dXiy" / Twitter fitbit on Twitter: "Got a Versa 3? Now, you've also got high & low heart rate notifications. Just update your watch in the Fitbit app. https://t.co/kn8Wb2dXiy" / Twitter](https://pbs.twimg.com/amplify_video_thumb/1408447393453023238/img/zaOErMC2Tb3RNUrz.jpg)
fitbit on Twitter: "Got a Versa 3? Now, you've also got high & low heart rate notifications. Just update your watch in the Fitbit app. https://t.co/kn8Wb2dXiy" / Twitter
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